Visual text editor for Unix, based on sources of RAND Editor. Long tile ago it was a part of Demos Operating System project, Russia 1982-1991. It was developed and supported by Alex P. Roudnev, Moscow, KIAE.

TERMCAP variable contains a list of terminal capabilities.

co      Numeric     Number of columns
li      Numeric     Number of lines
nb      Flag        No bell
cm      String      Cursor movement
cl      String      Clear screen
ho      String      Home: move to top left corner
up      String      Move up
do      String      Move down
nd      String      Move right
le      String      Move left
cu      String      Draw cursor label
kh      String      Key Home
kH      String      Key End
ku      String      Key Up
kd      String      Key Down
kr      String      Key Right
kl      String      Key Left
kP      String      Key Page Up
kN      String      Key Page Down
kI      String      Key Insert Char
kD      String      Key Delete Char
k1      String      Key F1
k2      String      Key F2
k3      String      Key F3
k4      String      Key F4
k5      String      Key F5
k6      String      Key F6
k7      String      Key F7
k8      String      Key F8
k9      String      Key F9
k0      String      Key F10
F1      String      Key F11
F2      String      Key F12

Example for Linux terminal:

TERMCAP=:co#80:li#25:cm=\E[%i%d;%dH:cl=\E[H\E[2J:ho=\E[H:\
up=\E[A:do=\E[B:nd=\E[C:le=\10:cu=\E[7m \E[m:ku=\E[A:kd=\E[B:\
kr=\E[C:kl=\E[D:kP=\E[5~:kN=\E[6~:kI=\E[2~:kD=\E[3~:kh=\E[1~:kH=\E[4~:\
k1=\E[[A:k2=\E[[B:k3=\E[[C:k4=\E[[D:k5=\E[15~:k6=\E[17~:\
k7=\E[18~:k8=\E[19~:k9=\E[20~:k0=\E[21~:F1=\E[23~:F2=\E[24~: